# CVE-2024-42455: Deserialization in Backup & Replication

> Low-privileged users can delete arbitrary files with service account privileges via insecure deserialization in Veeam Backup & Replication.

- **Severity:** High 7.1 (`CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 4 Dec 2024
- **Updated:** 5 Dec 2024
- **Also known as:** GHSA-hw3m-2wrm-879c

## What is CVE-2024-42455?

CVE-2024-42455 is a high-severity unsafe deserialization vulnerability in Veeam Backup & Replication, published on 4 Dec 2024. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A vulnerability in Veeam Backup & Replication allows a low-privileged user to connect to remoting services and exploit insecure deserialization by sending a serialized temporary file collection. This exploit allows the attacker to delete any file on the system with service account privileges. The vulnerability is caused by an insufficient blacklist during the deserialization process.

Weakness: CWE-306 (Missing Authentication for Critical Functionality)

## Which versions are affected by CVE-2024-42455?

It affects 1 product.


Products: Veeam Veeam Backup \& Replication.

## How do I fix CVE-2024-42455?

No fix has been published for CVE-2024-42455 yet. Limit exposure of the affected software until one is available.

## Is CVE-2024-42455 being exploited?

There is no known exploitation of CVE-2024-42455 in the wild and no public exploit code.

## Other vulnerabilities in Veeam Backup & Replication

- [CVE-2024-40711](https://insights.sbomify.com/CVE-2024-40711/): Veeam Backup and Replication Deserialization (critical 9.8, exploited in the wild)
- [CVE-2022-26501](https://insights.sbomify.com/CVE-2022-26501/): Veeam Backup & Replication Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2022-26500](https://insights.sbomify.com/CVE-2022-26500/): Veeam Backup & Replication Remote Code Execution (high 8.8, exploited in the wild)
- [CVE-2023-27532](https://insights.sbomify.com/CVE-2023-27532/): Veeam Backup & Replication Cloud Connect Missing Authentication for Critical Function (high 7.5, exploited in the wild)
- [CVE-2026-21666](https://insights.sbomify.com/CVE-2026-21666/): Missing authorization in Backup and Replication (critical 10.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-42455 and fix it if it is affected.

What it is: CVE-2024-42455 is a high-severity unsafe deserialization vulnerability in Veeam Backup & Replication, published on 4 Dec 2024. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2024-42455 in the wild and no public exploit code.

Affected product: Veeam Backup & Replication. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2024-42455/ (Markdown: https://insights.sbomify.com/CVE-2024-42455/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-42455
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-42455
- OSV: https://osv.dev/vulnerability/CVE-2024-42455

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-42455/
Summaries are generated and may contain mistakes; the official description above is the record.